Fix broken PHPunit tests (#3690)

* Ensure phpunit tests are running against the blocks code and not what is included in WooCommerce core.

* cast to object to correct response expectations.

The change in https://github.com/woocommerce/woocommerce-gutenberg-products-block/pull/3679/files#diff-5d8cf88af3d9be56abf0b110a7500b3711552009533d894e07f0e891b4af266eL317 resulted in a change in shape for the response.

Author: nerrad

src/StoreApi/Schemas/CartSchema.php

@@ -338,7 +338,7 @@ public function get_item_response( $cart ) {
 			'needs_shipping'          => $cart->needs_shipping(),
 			'has_calculated_shipping' => $has_calculated_shipping,
 			'fees'                    => $this->get_item_responses_from_schema( $this->fee_schema, $cart->get_fees() ),
-			'totals'                  => $this->prepare_currency_response(
+			'totals'                  => (object) $this->prepare_currency_response(
 				[
 					'total_items'        => $this->prepare_money_response( $cart->get_subtotal(), wc_get_price_decimals() ),
 					'total_items_tax'    => $this->prepare_money_response( $cart->get_subtotal_tax(), wc_get_price_decimals() ),

tests/bootstrap.php

@@ -107,6 +107,7 @@ function wc_install_core() {
 tests_add_filter(
 	'muplugins_loaded',
 	function() {
+		define( 'JETPACK_AUTOLOAD_DEV', true );
 		wc_load_core();
 		// install blocks plugin
 		wc_blocks_install();